Recording instrument



(No Model.) A. STBINBART.

RECORDING INSTRUMENT. No. 593,339. Patented Nov. 9,1897.

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RECORDING INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 593,339, dated November9, 1897.

Application led May 23, 1895. vSerial No. 550,395. (No model.)

To all whom, t may concern.-

Be it known that I, ALFRED STEINBART, a citizen of Germany, havingdeclared my intention of becoming a citizen of the United States, and aresident of Carlstadt, in the county of Bergen and State of New Jersey,have invented certain new and useful Improvements in RecordingInstruments, of which the following is a specification.

This invention relates to improvements in an instrument for recordingvariations in tensions.

The object of my invention is to provide a new and improved recordinginstrument which is simple in construction and records the" most minutechanges in tension very accurately without requiring` the parts of theapparatus or the recording-sheet to be of unduly large size and which isnot apt to get out of order.

In the accompanying drawings, forming a partv of this specification, andin which the same letters of reference indicate the same or like partsin all the Views, Figure lis a side elevation of my improved recordinginstrument, parts being in section. Fig. 2 is a plan view of part of thesame, showing the means for mounting the recording-lever pivotally. Fig.3 is a detail side view of the standard, spring, and screw.

The base-plate A is provided with the vertically-adjustable screw-legsA', by means of which said base-plate can readily be adj usted to be inhorizontal position. A casing B on the under side of the base-platecontains a suitable motor, preferablya clock-movement, for rotating thecylinder C, mounted on top of the base-plate, on a vertical axis, onwhich cylinder the sheet D on which the record is to he traced issuitably fastened.

The tracing-pen E, of the usual construction, is fastened on the end ofa lever F or tracer-holder provided at its opposite end with atransverse rod I1", to the ends of which wires or cords G are fastened,which have their opposite ends fastened to springs II, resting againstthe ends of screws G', mounted to turn in standards H on the base-plate.The springs hold the wires taut and can be adj-usted by means of thescrews Gr'. W'ith this device for hanging or pivoting the lever F thefriction is practically eliminated and the spring-tension of thesupporting device presses the tracing-pen with sufficient force againstthe paper to trace a line. A

lweight I is suspended from the lever F a central opening or neck of thevessel J and has its lower end connected with the lever F. The vessel Jis provided with a tight-fitting cover M, having an upwardly-projectingneck N, with which a pipe is to be connected for transmitting thetension of the gas or other medium of which the variation, in tensionare to be recorded to the said vessel J.

In some cases the leverF maybe connected with a bell P (shown in dottedlines in Fig. I) and suspended from said lever F, which bell dips into aliquid in a vessel O, into the upper part of which a pipe R leads.

The operation is as follows: As soon as a reduction in tension takesplace in the vessel J the bell-float K is raised by the greater pressureof the exterior air, and as soon as an increase in tension takes placebell-float K descends, the tracerE being moved accordingly and tracing acorresponding line on the sheet D, which is rotated uniformly and atacertain speed by the clock-movement.

In many cases it is desirable to eliminate the record until a change intension to a certain degree is reached, for the purpose of making thechart clear and distinct and showing the variations in tension on alarger and more distinct scale. The weight I, which is suspended fromthe lever F, is so selected that the change in tension required toovercome this weight corresponds to that part of the variation that isnot to be recorded. For example, when the scale is not to record anychanges until a suction of ten inches of water head is obtained theweight must be so se lected that a suction up to ten inches of waterheadis required to overcome said weight, and any additional suction producedserves to raise the weight still higher, and with it the tracer. Therecord of such changes in tension greater than the suction required toraise IOO the Weight will only be traced, and as soon as the suctionfalls belenr that required for lifting the Weight the tracer Will remainin its bottom position. Thus by using a proper Weight the record of thechanges up to any desired degree can be eliminated from the record.

In some cases it is desirable to have the instrument influenced by thedifference in tension between a gas in its normal state and a gas afterthe saine has been subjected to the influences of chemicals for thepurpose acting on some of the constituents, by which action the tensionof gas is affected, and in this ease the gas, in its original state, isconducted through the pipe R (shown in dotted lines) into the vessel Oand the gas that has been acted upon is conducted into the vessel J. Itthe gas in its original composition is under suction, it tends to drawdown the lever F, thereby aieeting the line traced accordingly, and ifit is under pressure it relieves the lever F of the Weight of the bell Pand affects the line traced accordingly.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In an instrument for recording the variations in the tension ofgases, the combination with a Vessel closed at the top and having anupwardlyprojecting neck at its bottoni which neck is open at the top, aliquid-seal plunger in said vessel, a rod extending from said plungerthrough the bottom neck of the vessel and a tracer connected with saidrod and a n1ovable support for paper on which the tracer can tracesubstantially as herein shown and described.

2. In aninstrurnent for recording the variations in the tension ofgases, of a vessel closed at the top and having an upwardlyextendingneck in its bottom which neck is open at its top, a tube connected withthe upper part of the vessel and serving for conveying the gas of whichthe variations in tension are to be recorded, into said vessel abell-shaped liquidA seal plunger in said vessel, a rod extending fromsaid seal-plunger down through the neck in the vessel, a tracer on saidrod and a movable support for a sheet on which a record is to be tracedby said tracer, substantially as herein shown and described.

In testimony that I claim the foregoing as my invention I have signed mynaine, in presence of two witnesses, this 15th day of May, 1895. V

ALFRED STElNBARI.

IVituesses:

Oscarh F. GUNZ, D. PETRLPALMEW').

